Police Duty Act Article 12

Household visit is an individual duty that is to be carried out by its beat officers. While patrol, routine check, police watch, duty counter, and stand-by duty are general duties which are performed by officers who work rotating shifts according to the duty rosters.The aforementioned general duties in the preceding paragraph may be altered to patrol or other duties according to the number of duty officers and public order situations. Nevertheless, patrol shall be the primary duty to be scheduled.
中文原文 警察勤務條例第12條
勤區查察為個別勤務,由警勤區員警專責擔任。
巡邏、臨檢、守望、值班及備勤為共同勤務,由服勤人員按勤務分配表輪流交替互換實施之。
前項共同勤務得視服勤人數及轄區治安情形,採用巡邏及其他方式互換之,但均以巡邏為主。

English translation for reference only; the Chinese text prevails. Not legal advice.